Chapter 3

Troubleshooting

Diagnosing Hub LEDs

Power and Cooling Problems

Installation

Verification

The hub can be easily monitored through panel LEDs to assist the network manager in identifying problems. This section describes common problems you may encounter and possible solutions.

Symptom. 10/100M Link LED does not light up after making a connection.

Cause. Network interface, for example a network adapter card on the attached device, network cable, or hub port is defective.

Solution. Verify that the hub and attached device are powered on. Be sure the cable is plugged into both the hub and corresponding device. Verify that the proper cable type is used and its length does not exceed specified limits (100 meters/328 feet when connecting to a workstation or switch, and 5 meters/16 feet when connecting to another hub). Check the network adapter on the attached device and cable connections for possible defects. Replace the defective adapter or cable if necessary.

Symptom. Power LED is not green after power-ON.

Cause. Defective power outlet, power cord, or internal power supply.

Solution. Check the power outlet by plugging in another device that is functioning properly. Check the power cord with another device. If these measures fail to resolve the problem, have the unit's power supply replaced by a qualified Allied Telesyn distributor.

If the Power LED is not lite when the power is applied, you may have a problem with the power outlet, power cord, or internal power supply as explained in the previous section. However, if the unit powers OFF after running for a while, check for loose power connections, power losses or surges at the power outlet, and verify that the fan on back of the unit is unobstructed and running prior to shutdown. If you still cannot isolate the problem, then the internal power supply may be defective. In this case, contact your Allied Telesyn distributor for assistance.

Verify that all system components have been properly installed. If one or more components appear to be malfunctioning, for example the power cord or network cabling, test them in an alternate environment where you are sure that all the other components are functioning properly.

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Allied Telesis AT-FH824U-SW, AT-FH812U-SW manual Troubleshooting, Installation Verification

AT-FH812U-SW, AT-FH812U, AT-FH824U-SW, AT-FH824U specifications

The Allied Telesis AT-FH824U and AT-FH812U series possess outstanding features suitable for various network requirements. These models are designed to deliver reliable performance, security, and ease of management for modern networking environments.

The AT-FH824U is an 8-port Fast Ethernet switch, engineered to provide high-speed connectivity for small to medium-sized networks. It supports a variety of media types and has 24 Gigabit Ethernet ports, which allow for seamless integration with existing network infrastructures. The device employs a non-blocking architecture, ensuring that data packets are routed efficiently without bottlenecks. Each port can automatically negotiate speeds between 10/100 Mbps, making it versatile for various devices. The switch also provides advanced features such as VLAN support, enabling network segmentation for improved performance and enhanced security.

Similarly, the AT-FH824U-SW variant adds an important layer to network management with its smart features. This managed switch version allows network administrators to monitor and control traffic flow through simple GUI interfaces or command-line SNMP management. The integration of Quality of Service (QoS) capabilities ensures that critical applications receive priority bandwidth, enhancing overall network efficiency.

On the other hand, the AT-FH812U is a more compact model with 12 Fast Ethernet ports. Ideal for smaller office environments, it delivers reliable networking with the same level of performance as its larger counterparts. It also supports IEEE 802.1Q for VLAN tagging, providing improved network functionality and security. This switch can be mounted in a standard rack or placed on a desktop, adding to its versatility.

The AT-FH812U-SW incorporates managed functionality, allowing users to access advanced settings and configurations. With features such as loop prevention, broadcast storm control, and port mirroring, it offers the robustness needed for more complex networking scenarios.

Allied Telesis switches are built with energy-efficient technology, minimizing power consumption without compromising performance. Enhanced security protocols including port security and access control lists make these switches suitable for businesses focused on safeguarding their networks against unauthorized access.

Overall, the AT-FH824U, AT-FH824U-SW, AT-FH812U, and AT-FH812U-SW models offer a blend of technology and performance, catering to the diverse needs of modern network infrastructures. These switches deliver scalability, manageability, and security, making them an ideal choice for various networking applications.